Question

Percentage of nitrogen and oxygen in the air is ____ respectively.

• A. 70% and 30% approx
• B. 80% and 20% approx
• C. 78% and 21% approx
• D. 60% and 40% approx

Answer 1

The correct option is C

78% and 21% approx

Air is a mixture of many gases. It is primarily composed of approx 78% nitrogen and 21% oxygen with only small concentration of other gases such as carbon dioxide and argon.